Reshaping the Role of CO₂ in Propane Dehydrogenation: From Waste Gas to Platform Chemical

Abstract

The valorization of CO 2 appeals to the chemical industry due to the reduction in greenhouse gas emissions and the ability to offer more renewable products. Propylene production is the second largest process in the chemical industry, and it strongly depends on fossil fuel feedstocks. Coupling CO 2 reduction with propane dehydrogenation boosts conversion and produces CO, a valuable platform chemical currently synthesized by fossil-methane reforming. In this work, (i) we demonstrate the environmental benefits of coupling CO 2 with a life-cycle assessment under industrial conditions, potentially reducing emissions by 3 t CO2-eq per ton of propylene produced. (ii) We screen supported catalytic materials�both known and novel�with a focus on propane and CO 2 reaction mechanisms under industrial reaction conditions of 400−700 °C and pressures of 1−6 barg (redox: V,

IrGa Bimetallic Catalyst with Atomical Metal Dispersion for Propane Dehydrogenation with High Stability

“…It is noteworthy that the combination of Ir and Ga had a significant impact on the reduction behavior. The reduction of IrO x was inhibited while that of GaO x was promoted and initiated at around 500 °C, implying an eutectic effect between Ir and Ga [5] . In a similar PtGa/Al 2 O 3 system, Zhang et al.…”

“…The wide application of light olefins (ethylene, propylene, and butenes) in the chemical industry has driven a continuously growing market with an annual demand exceeding 320 million tons worldwide [1] . The conventional processes, including steam cracking and fluid catalytic cracking (FCC) of naphtha, can hardly meet the booming market demand due to the limited crude oil reserve and increasingly stringent environmental policies [2–5] . Therefore, the development of on‐purpose technologies to alleviate the shortfall of light olefins is urgent and promising, such as methanol to olefins, hydrogenation of CO/CO 2 to olefins, and the emerging dehydrogenation of light alkanes [6–10] .…”

“…[1] The conventional processes, including steam cracking and fluid catalytic cracking (FCC) of naphtha, can hardly meet the booming market demand due to the limited crude oil reserve and increasingly stringent environmental policies. [2][3][4][5] Therefore, the development of on-purpose technologies to alleviate the shortfall of light olefins is urgent and promising, such as methanol to olefins, hydrogenation of CO/ CO 2 to olefins, and the emerging dehydrogenation of light alkanes. [6][7][8][9][10] In the recent past, the large-scale exploitation of both conventional and unconventional gases (shale gas, tight gas) promotes the alkane dehydrogenation process as one of the fastest-growing technologies in olefin production, especially propane dehydrogenation (PDH).…”

Preparation, Structure‐Performance Relationship, and Reaction Network of ZnZSM‐5 for Oxidative Dehydrogenation of Ethane with CO2

“…The combination of Equations (2)–(4) forms an indirect CO 2 ‐ODH pathway. Meanwhile, there are several side reactions such as dry reforming [Equation (5)], coking [Equation (6)], Boudouard reaction [Equation (7)], and C 2 H 6 cracking [Equation (8)], leading to the formation of other products including H 2 , CH 4 , coke, etc [29–32] $$$\vcenter{\openup.5em\halign{$\displaystyle{#}$\cr {\rm C}{_{2}}{\rm H}{_{6}}+{\rm CO}{_{2}}={\rm C}{_{2}}{\rm H}{_{4}}+{\rm H}{_{2}}{\rm O}+{\rm CO}\hfill\cr}}$$$ $$$\vcenter{\openup.5em\halign{$\displaystyle{#}$\cr {\rm C}{_{2}}{\rm H}{_{6}}={\rm C}{_{2}}{\rm H}{_{4}}+{\rm H}{_{2}}\hfill\cr}}$$$ $$$\vcenter{\openup.5em\halign{$\displaystyle{#}$\cr {\rm CO}{_{2}}+{\rm H}{_{2}}={\rm H}{_{2}}{\rm O}+{\rm CO}\hfill\cr}}$$$ $$$\vcenter{\openup.5em\halign{$\displaystyle{#}$\cr {\rm CO}{_{2}}+{\rm 4H}{_{2}}={\rm CH}{_{4}}+{\rm 2H}{_{2}}{\rm O}\hfill\cr}}$$$ …”

“…Meanwhile, there are several side reactions such as dry reforming [Equation ( 5)], coking [Equation ( 6)], Boudouard reaction [Equation ( 7)], and C 2 H 6 cracking [Equation ( 8)], leading to the formation of other products including H 2 , CH 4 , coke, etc. [29][30][31][32] C…”